The kinetic energy of a particle executing $S.H.M.$ is $16\, J$ when it is in its mean position. If the amplitude of oscillations is $25\, cm$ and the mass of the particle is $5.12\, kg$, the time period of its oscillation is
  • A$\frac{\pi }{5}\,sec$
  • B$2\pi \,sec$
  • C$20\pi \,sec$
  • D$5\pi \,sec$
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